![]() ![]() The impact ages obtained range between approximately 3.3 and 4.3 billion years (Ga). Fifteen samples were studied including crustal material, polymict feldspathic fragmental breccias, and impact melts. Selection of these samples was aimed at the old 40Ar- 39Ar ages to understand the early history of the lunar magnetic field and impact flux. ![]() New petrography and 40Ar- 39Ar ages have been obtained for 1–3 mm sized rock fragments from Apollo 16 Station 13 soil 63503 (North Ray crater ejecta) and chips from three rocks collected by Apollo 16 and Apollo 17 missions.
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